This is very important question for me as it may help me in my imaging later.

I am planning to buy Astrodon LRGB filters beside NB filters ofcourse, but because i am under light pollution area i don't know how much bad it can be for L filter at least, so do you recommend me to use another L filter or light pollution filter instead of this Lum filter in LP? and how much difference or improvement it may give?

For example CLS or L-Pro or anything else, I even saw IDAS and Astronomik have narrower L filter than standard one, will there be any difference then or any filter not NB will be completely useless in LP mainly L anyway?